Most of the strategies have been covered here - dating apps and bars. I'll add that in bigger cities Lex is used as not just personals but community building. Meetup.com some places too. Chat up bartenders they frequently hear where parties are at. Search eventbrite, Facebook, bloom, and fetlife.

Do you have a local gay community center or gay paper? Or just any sort of alternative weekly? Those are classic ways to find people & activities. Maybe also go round the bars and check for fliers or publications. Bars partly function as community centers.